Environment-Mediated Quantum State Transfer

TL;DR

This paper introduces a quantum state transfer scheme utilizing a shared boson environment, analyzing conditions for high fidelity transfer and mapping the problem to a wave propagation model.

Contribution

It presents a novel approach to quantum state transfer mediated by a common boson environment and provides a complete phase diagram for the process.

Findings

High fidelity transfer when qubits are equally coupled to the boson

Fidelity decreases with nonsymmetric couplings

Mapping to wave propagation enables analytical solutions

Abstract

We propose a scheme for quantum state transfer(QST) between two qubits which is based on their individual interaction with a common boson environment. The corresponding single mode spin-boson Hamiltonian is solved by mapping it onto a wave propagation problem in a semi-infinite ladder and the fidelity is obtained. High fidelity occurs when the qubits are equally coupled to the boson while the fidelity becomes smaller for nonsymmetric couplings. The complete phase diagram for such an arbitrary QST mediated by bosons is discussed.